A pinched nerve in a dog will cause numbness down one leg. Take something that you can lightly prick the dog with, such as the tip of a clean safety pin. Gently touch the dog in each leg. If there is no reaction in one leg, there is numbness.

you can see his or her legs swelling or they can walk with 4 feet you will see them disable for a moment but do not worry it will back to its orginal walking thats all i know in the animals just take care of your dog. dogs are mans best friend

My dog isn't using his right back leg like he should and when he runs he sometimes trips his other leg. He drags that foot and the toe nails are warn down. He also curls his toes under when he stands, like a horse does at rest.